Design three AWESOME mocks/layouts for a tower defense game

Job Description

I'm working on a tower defense-style of 2D game that will differentiate by supporting features related to real-world location. However, the game is going to be very, very simple - no backstory, no complex setup, minimal attention span needed, completely addictive.

I'm looking for a game designer who can present me with three distinct mockups of design/theme/look&feel for the game. This is a greenfields project - you can let your mind run free.

Some guidance though - the art is secondary to the gameplay, since I want this game easy to play. Most tower defense games these days want to run you through 5 explanatory screens detailing the game backstory. Not us.

To give you a sense, the game mechanic will be identical to this game - to be clear, we are NOT copying this game, but employing an extremely similar mechanic. You will succeed in this project if you consider the goal to be reskinning this game:

I don't mind the arcade-style artwork, but am open to illustrative art if you can make the simple feel work. Either way, put some time into making a few mockups and let's see what looks like it has potential.

Sound like the perfect gig for you? Well, let's get started! Send me your best work, be ready to put together 3 theme boards for distinct design ideas you have, and let's go!